Pencil-sharpening device



E 1,672,429 G. H. SCHMIDT PENCIL SHARPENING DEVICE l June 5, 1928.-

Fled June l2, 1926 lill) INVENTOR.

Gas m VE H. SCHMIDT ATTORNEYS.

, blade in the direction of thevpencils length,

Patented June 5, 1928.

I UNITED STATES PATENTv OFFICE.

GUsTAvE H. SCHMIDT, oF ALHAMBRA, CALIFORNIA.

` PENCIL-SHARPENING ADEVICE.

Application mea'zrune 12, 192e.` Serin No. 115,586.

My invention relates to and has for its purpose the provision of` a durably constructed and extremely efficient pencil sharpeninfr device b which f a symmetricallv e Y y tapered point can be formed upon a pencll with ease and dispatch, and which is adapted lto use, although notnecessarily, oldsafety razor blades as the Acutting instrument.`

A further purpose of my invention is the provision of a device of the above -described character in which the point is formed yupon the pencil by av shaving action of a cutting I will describe only oney form of pencil sharpening device -embodying my invention and will then point out the novely features` thereof in claims.

In the accompanying drawings Figure l is a top plan view illustrating onel form of'pencilsharpening device embodying my invention;

Figures 2 and 3 are vertical sectional views i taken, respectively,on the lines 2-2 and 3 3 of Figure 1 and looking in the direction of the arrows;

Figure 4 yis an enlarged detail 'sectional view taken on the lines 4 -4 of kFigure 2 and looking in the direction of thearrows;

Figure 5 is ya fragmentary' bottom .plan

view illustrating, a portionl of the mechanism for rotating the pencil. e

Referring specifically to the drawings, in which similar characters of reference designate similar parts in each ofthe severaly views, my Invention, 1n itspresent ,embodiment, comprises a frame' F preferably "f formed of metal to provide :a box-like structure having a bottom 15, side walls 16, and

end walls 17. The frame, in additionr to providing a support for vthe mechanism of the devicealso providesfa depository-forthe shavings removed froma `penciland to its bottom 15 is secureda screw clamp 18 rby which the frame is adapted to bei clamped to a suitable support. A blade holder of subi stantially rectauirigulary form ,and designated generally at H is s'ldablymountedon horizontal guide rod's 19 passingfreely through perforated ears 2O formed at the ends 'e of .the holder, f therods being secured at one of their ends by nuts 21 to one of the end walls 17 and-atthe other of their ends to brackets 22 securedv to the inner sides of the walls 16 by screws 23. The holder constitutes a carriage for supporting a conventional safety razor blade vB and to securely-'clamp the blade'thereto with its .cutting edge projecting therefrom, a pair of upstanding pins 24 and a threaded'stud 25 are secured to the holder `and are adapted to be received' in the usual openings provided yin the'. blade as wellas in similarly spaced openings formed in a clamping plate 726. A handle 27 thread-l edly engages the stud 25 and operates to sefcurely clamp the blade .between plate and holder and also servies as a means by'which .an operatorv can readily reciprocate vthe holder upon the guide rods 19. It will be' noted that the top surface of the holder'and the bottom surface of the .plate are curved transversely soy that when the blade is clamped between the two it is flexed transversely toA present its cutting edge downwardly at a slight angle.

yFor supporting a pencilv with itsv end to be sharpened. in an upwardly 'inclined position with respectto and in the path of movementk of the cutting blade so that upon reciprocation Vof the latter a shaving of the pencil in the direction of its length will be effected, a clampingmember C is rotatably mounted in a bracket 28. The clamping member is of tubular form to freelyrreceive ya pencil Pand toV securely clamp the pencil thereinthe member is provided externally .at one end' with taperedthreads 29 and is slotted longitudinally at o intervals to provide flexible sections 30 which are adaptedto be constricted to grip the pencil by meansof a knurled nut 31 threadedly engaging the `'threads 29; The bracket 28 is supported for sliding movement in the frame byl means of a threadedy sha-ft 32jth'readed through an opening formed in the bracketandrotatably .mounted in the sidewalls 16. The shaft 1s fixed against longitudinal movement by a nut 33 and an operating knob 34 securedto the shaft and disposed exteriorly of the frame. By 'rotation of the knob itr will-be clear that the bracket 28 and consequently the clamping r member C wllbe adjusted transversely with respect the path movetft f the Sutting blade so that in the event one portion of the blade becomes dull, the pencil can be moved to occupy another position along the length of theblades cutting edgjthus permitting the entire length of the latter t0. be utilized. y

In addition7 the bracket 28 is capable being rocked slightly upon the shaftBQf against the tension of a fiat spring T lsecured to the vbracket and bearing against the bottom 15 of the 'frame so that in the event too heavy a cut is being taken upon the pencil, the vlatter can yield and the danger of breaking .the pencil or cutting blade thus minimized. i 'i To rotate the reciprocation of Jthe holder AH and thus present a new surface of the pencil to. the blade at each cutting stroke thereof the `following,mechanism is provided. cam member 36 in the `'form of ai'lat b ar having a cam surface 37 is secured to the holder eXteriorly of the frame F by rmeans of V threaded studs 38 projecting' through a slot 39 orn'ied `ifn one ofthe side walls 16 land threaded into the holder. A rack bar 40 is slidablyy mounted in the sidewalls '16 and adjacent one of its ends provided with y transverse recess 41, the bar being normally urged to a positionifn which the recess is out ofY alineinent with `the cam member by means of an expansible spring 42 interposedl between the side wall 16 and a pin 4B secured' I to the bar. The rack bar has meshing engagementv with a gear 44A of ring` lorIn mounted on the clamping' m'eiiiber Cand for transmitting,rotative movementof the gear to the clamping member in one directiononly clutch K is interposed between the two; In this instance the clutch. comprisesa collar 45 weldedl or otherwise'secured to one of the; flexible sections 30 and provided upon its0A periphery with wedge shaped, pockets 46dA l(Figure 4i)y receiving balls' 47 -whic'h'u on motion of the gea/F44 in the direc'titin,offA

the arrow are wedged into 'the' smallerendof thepoclet's and" into locking engagement with the gear. ure 2 that the vpockets are alsoL oppsitely Vtapered transversely so that lateralE displacement ofthe gear from the ring is prevented.

In operation with' the :nadie .F1 @1am ed? toa support and theblade liolderH'occupy, I

in'gtlie positionshown inFigurela pencil is inserted into the clan ip'ing C ai 'siiiicientdistanoe to' ydispose theend` to be" rsharpenefd in the path of movement Vof the cuttingiiiad B. The 1111631' is now'u'gha eneid" `to 'securellyfclarnp't le pencil in thef member and" the holder movedY manually inl 'the vdirection 'of theV arrow (Figure`1)/by means of the handle 27,130 eifect vav shaving cut-'upon 'the pencil. Adj acentthe end of the'y return moyement of i the holder, they cam sur pencily slightly upon each It willi be noted. freni Fig-f:

VarrowY and throughfthefmedium of the gear 44 and clutch K a partial `rotation of the clamping lmember C and consequently the iia'oe of theilatter to the blade upon its succeeding cutting stroke. As the cam surface 37 moves out otengageinent with the' recess .'41 during'the Inent cutting strolernt theiiblafde thelspring 42 returns the raclr bar 40 '4to' its initiall position limited by thestop` pin thus reverjlfly rotating the gear 44wjhich`by virtue oi theuni-.diriectlional clutch K moves freely on the coll'arf45l f lt will 'thus beclear that upont each-1ieciprocation of the holder a l rotationl of the pencil isaccoinplished sothata point oic 4syrnrnetrically tapered'torm will ultimately be formed' thereon.'

lth'ougliK I 'h'ave lier'ein shown andfjdescribed only one: forni 'of pencil sharpening device embodying my invention, itis't'io' be understood 'that various changes and modificatio'ns i;artig from' thev spirit" ot'jthe invention' and zthe's'pirit and" scope of `the appended claims. If claim invention: v 1*. A pencil device comprising a VboXJi-kfe str`i`ict'iirer having an open top` side'sand aclsed bottoni and constituting a frame adapted to beclamped to a support, 'guide rods" seciired l to the trainen" manually jeweiligen-aeiieiaf Capanne a; Cafrtiageslidably 'on saidrods, upstanding `pins secured to said carriage adapted tdbfJ receiycdiin' openings oi'medfinjacutting blade, a blade clampifrfg` plate lnivingopenings vreg-y 'is't'le'ifi with said pins', ti handle thieaded on one of Asaid Ipinsand adaptedto clanipthe Cutting biafieeeveen*nie-pnt@ and @n1-ege, af bracket adjustable=- in `the rame transversly' of the direction of movement ofthe carriage, a tubular clamping nienibe'r rota"- .pencil is effected, thus presenting a new surbre opcrateriAv 'l the carriagfe'- for' imparting mounted 'for reciprocatdry movement jintlie bitlarclampingnieiiiber rotatably mounted in bracket' adaited receive ys upport a pencil' inL afpositi'on to be-v angularly Shawnee@ een@ one laeufbyaat tingblade;atgearinountedon said clamping mem er', j clutch' interposed between said y clamping' 4 In erilierr gtol i" operatively Connecting th''twov apf'n rtation Vofthe gear in t, one ldirect-iononly", a 4rack bar meshing said' gear 'and having; a' transverse 're-v cess;v said" bar 'niougnted for-movement in lvthe frame from one extreme position to another eXtreme position, means for'f'normally .urging the barto one of its extreme positions, and a member secured to theIk carriage having a cam surface adapted to be received in said recess during the return stroke of the carriage for moving the bar to its other'extreme position against the action of its urging means whereby through the medium of said gear and clutch partial rotation of the clamping member will be etfected.

3, A pencil sharpening device comprising a pencil support, a blade holder mounted for movement to effect a shaving cut by its bladev upon a pencil in thesupport and means for mounting said support `to yield when through improper positioning of the pencil' With respect to the blade, the latterattempts `to effect a relatively heavy cut, to thereby and means controlled by the movement of the holder for partially rotating said member progressively and comprising a rack bar mounted for movement, a gear meshing With the rack bar, co-acting means on the holder and rack bar for effecting movement of the latter to rotate' thekgear, and av clutch for;

operatively connecting the gear to the member during rotation of the gear in one di-v rection.

5.y A pencil sharpeningdevice comprising.

a frame, a blade holder including a carriage mounted for reciprocatory movement in the frame, a bracket supported by the'frame, a

tubular clamping member rotatably mounted in the bracket and adapted to receive and support a pencil in a position to be angularly shaved in the direction of its length by a cutting blade, a ,gear rotatably mounted on said clamping member, a uni-directional clutch for operatively connecting the gear to the member, a rack bar meshing with said' ear, vsaidbar mounted for movement 1n the rame, and normally urged to one extremev position, Vand cam means secured-to the carriage adapted to engage and actuatelsaid bar at one end of the stroke of the carriage and through the medium of said gear and clutch to effect partial progressive rotation of the clamping member.l f

6. Apencilfsharpening device comprising ra frame, a-blade holder including a carriage mounted for reciprocatory movement in the frame, a bracket supported by the frame, a

tubular, clamping member rotatably` mounted in the bracket and adapted to receive and support a pencil ina position to be angularly shaved in the direction of its length by a cut-l ting blade, and means controlled by the n movement of the carriage for progressively rotating the clamping member, said bracket being adjustable in the frame transversely With respect to the length ,of the cutting,y blade ,and ysaid adjustment comprising a threaded shaft threadedly engaging the bracket and rotatably mounted in the frame, and an operating knob secured to the shaftv by which the latter can be rotated to feed the bracket along its length toy thereby permit the entire length of the blades cutting edge to be utilized. l y

GUs'TAvE H@ SCHMIDT. l 

